Connector Description
3.6
TP5, IADJ
The IADJ test point connects through a two-pole low-pass filter to the IADJ pin of the TPS92691-Q1
device. The default reference is set to 420 mV through a resistor divider network connected to VCC
resulting in output current of 300 mA. The voltage on IADJ can be externally set using either a pulse width
modulated signal from function generator or a DC power supply between 140 mV to over 2.4 V. For more
details on setting analog adjust voltage refer to
.
3.7
TP4, IMON
The IMON test point connects directly to the IMON pin of the TPS92691-Q1 device. The IMON voltage,
corresponding to measured LED current by integrated rail-to-rail current sense amplifier, can be monitored
with this test point. The pin can be connected to an external comparator or microcontroller to detect LED
short-circuit, LED+ to VIN, and LED+ to GND fault conditions.
4
Electrical Performance Specifications
Table 1. TPS92691EVM-001 Electrical Performance Specifications
Parameter
Test Conditions
MIN
TYP
MAX
Unit
Input Characteristics
Input voltage range
7
14
40
V
Input UVLO setting
4.5
V
Maximum switch node voltage
100
V
Output Characteristics
Output voltage, VOUT
LED+ to LED–
2
40
65
V
Output current
100
300
1700
mA
Maximum output power
25
W
Analog dimming range
V
IADJ
= 140 mV to 2.4 V
17:1
PWM dimming range
240-Hz PWM frequency
100:1
Systems Characteristics
Efficiency
Input voltage = 14 V, 13 LEDs, I
LED
=
90%
300 mA
Switching frequency
390
kHz
5
SLVUAL8 – December 2015
TPS92691 SEPIC LED Driver Evaluation Board
Copyright © 2015, Texas Instruments Incorporated